986397509 has 2 divisors, whose sum is σ = 986397510. Its totient is φ = 986397508.

The previous prime is 986397497. The next prime is 986397523. The reversal of 986397509 is 905793689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617373409 + 369024100 = 24847^2 + 19210^2 .

It is a cyclic number.

It is not a de Polignac number, because 986397509 - 2⁴ = 986397493 is a prime.

It is a super-2 number, since 2×986397509² = 1945960091522810162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (986397539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493198754 + 493198755.

It is an arithmetic number, because the mean of its divisors is an integer number (493198755).

Almost surely, 2^986397509 is an apocalyptic number.

It is an amenable number.

986397509 is a deficient number, since it is larger than the sum of its proper divisors (1).

986397509 is an equidigital number, since it uses as much as digits as its factorization.

986397509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The square root of 986397509 is about 31406.9659311434. The cubic root of 986397509 is about 995.4451209097.

The spelling of 986397509 in words is "nine hundred eighty-six million, three hundred ninety-seven thousand, five hundred nine".